A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Changchun, northeast China's Jilin Province, March 30, 2022. (Xinhua/Zhang Jian)
A medical worker takes a swab sample from a resident for nucleic acid test at a COVID-19 testing site in Changchun, northeast China's Jilin Province, March 30, 2022. (Xinhua/Zhang Jian)
